Load options for audio tracks.
Load options for frame image manifests loaded as sidecar video. Frame images have no sound, muted and crossOrigin are ignored.
Load options for HLS streams loaded as sidecar video.
Load options for marker tracks.
Load options for MP4 files loaded as sidecar video.
Load options for observation tracks.
Load options for text (subtitle/caption) tracks.
Load options for thumbnail tracks.
Load options for trick track, frame image manifest shown while main media plays backwards or faster than max native playback rate. muted and crossOrigin are ignored.
Maps each TrackType to its concrete load-options type.